A spaceship from Earth is equipped with a virtual-reality device to
help those aboard cope with their 10-year mission. But when the system
malfunctions, it puts the Phaeton's crew -- and the fate of their
planet -- in jeopardy.
From the movie's Wikipedia page, here are a few plot points:
The pilot picks up approximately six months after the launch of the
Phaeton [and it's getting closer and closer to Neptune]. The crew now
faces a "go or no-go" situation, in that they are fast approaching
their last chance to change course back towards Earth.
However, their home planet is quickly becoming uninhabitable, with dry land becoming a commodity. Scientists estimate that the planet
will become completely inhospitable within the next hundred years. The
Phaeton's priority mission has been changed to that of searching out
and discovering a new planet for humans to inhabit.
The AI begins to take control of the ship...
[Lately] the crew's virtual reality simulators have been experiencing several bizarre glitches, all of which involve a mysterious man,
whose acts against the crew inside the virtual simulations become more
and more disturbing.
Commander Frank Pike is the one leading the mission. A description of the "accident":
The communications array fails to deploy, and after Dr. Jules Braun
tries everything that he can from inside the ship, Pike, Rika, Val
Orlovsky and Manny Rodriguez prepare to identify the problem from the
While preparing for EVA [Extra-vehicular activity], the airlock
chamber closes by itself, with Pike inside and without his pressure
suit helmet. Despite efforts to save him, the airlock opens and Pike
~ Synopsis from allmovie; Images from DEN OF GEEK!, NY Daily News and TrekMovie.com
Read more about it here and here.